【官方指南】新GRE数学真题OG例题讲解之平面几何题

22.Which of the following statements individually provide(s) sufficient additional information to determine the area of triangle ABC above? Indicate all such statements.

A DBC is an equilateral triangle.

B ABD is an isosceles triangle.

C The length of BC is equal to the length of AD.

D The length of BC is 10.

E The length of AD is 10

23.The fabric needed to make 3 curtains sells for $8.00 per yard and can be purchased only by the full yard. If the length of fabric required for each curtain is 1.6 yards and all of the fabric is purchased as a single length, what is the total cost of the fabric that needs to be purchased for the 3 curtains? A $40.00

B $38.40

C $24.00

D $16.00

E $12.80

24.The fabric needed to make 3 curtains sells for $8.00 per yard and can be

purchased only by the full yard. If the length of fabric required for each curtain is 1.6 yards and all of the fabric is purchased as a single length, what is the total cost of the fabric that needs to be purchased for the 3 curtains? A $40.00

B $38.40

C $24.00

D $16.00

E $12.80

25.In the xy-plane, the point with coordinates (–6, –7) is the center of circle C. The point with coordinates (–6, 5) lies inside C, and the point with coordinates (8, –7) lies outside C. If m is the radius of C and m is an integer, what is the value of m ? m =_____

26.What is the least positive integer that is not a factor of 25! and is not a prime number?

A 26

B 28

C 36

D 56

E 58

27If 1 is expressed as a terminating decimal, how many nonzero digits

1/[(211)(517)] will the decimal have?

A One

B Two

C Four

D Six

E Eleven

28.Eight hundred insects were weighed, and the resulting measurements, in milligrams, are summarized in the boxplot below.

(a) What are the range, the three quartiles, and the interquartile range of the measurements?

(b) If the 80th percentile of the measurements is 130 milligrams, about how many measurements are between 126 milligrams and 130 milligrams?

29.The figure shows a normal distribution with mean m and standard deviation d, including approximate percents of the distribution corresponding to the six regions shown.

Suppose the heights of a population of 3,000 adult penguins are approximately normally distributed with a mean of 65 centimeters and a standard deviation of 5 centimeters.

(a) Approximately how many of the adult penguins are between 65 centimeters and 75 centimeters tall?

(b) If an adult penguin is chosen at random from the population, approximately what is the probability that the penguin’s height will be less than 60 centimeters? Give your answer to the nearest 0.05